If I may jump in here for a minute.... This whole light/dark thing comes up from time to time. There's actually a lot written/discussed on it here in various places throughout the forum. Generally, you don't have to be worried about it. The spirit keeping definitions of "light" as opposed to "dark" is totally subjective and honestly bullshit. It's these very labels that the spirit keeping community places on these spirits and/or entities that give rise to most of these concerns.
We need to be honest, these titles are total bullshit. For example, angels get categorized as WAs, meaning incapable of doing any harm. I challenge you to pick up any religious text involving angels and then attempt to apply that definition. Angels have been ruthless and very destructive thoroughout our religious texts. By the same "WA" definition, if it actually applies, those spirits not only wouldn't help you if you needed them, they wouldn't be even able to help themselves. Seriously, who wants that? On the other end of the spectrum they apply this BA definition, meaning incapable of doing "good" (I quote "good" because good and evil are also subjective terms). Demons frequently are demonized and placed in that category. But, as anyone here can tell you, demons are just as capable of "good" as you or I. Are there things that are truly bent on nothing but destruction? Yeah, probably, but that true BA definition largely would only apply to non-intelligent beings that simply destroy without thought or emotion. In reality, 99.99% of the spirits/entities out there are capable of "good" or "evil" and can choose how to behave. They're not tied down to these definitions.
Also, it's not like they look at each other like the crips and the bloods based on their WA/DA labels. As in, there isn't a rivalry based on how the conjurer chooses to label them. It's not like all of your WA are going to gang up and go all west side story on the DA beings because that's how they were labeled. They're individuals and they understand their nature better than the conjurer, or you or I.
There may be some issues based on racial categorization. Some things naturally do or don't get along better than other things. That can be a concern. But, in most cases, it's more individual personality driven. After all, each spirit and entity is unique.
So, in conclusion, I would not worry about this a bit. They're smart. They're there because they chose to be. They'll probably get along. They're enlightened beings, not petty children. So, relax!